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newSchoolWorks.com › VoTechWorks › Hospitality, Food & Tourism › Culinary Arts › Kitchen Operations: Workflow, Equipment & Culinary Management › Lesson 7
HOS-CULI27-08 · Lesson 7 · 13 clock hours · theory

Food Cost, Yield, and Portion Control

Objective. Students calculate as-purchased cost, edible-portion cost, yield percentage, and food cost percentage for a set of raw ingredients, and adjust recipe quantities using a conversion factor.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a certified food-safety manager and industry professional or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

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Why Food Cost Math Matters

Every professional kitchen operates inside a budget. When a chef does not track what ingredients cost versus what dishes sell for, the operation loses money even when the dining room is full. Food cost math — yield percentage, edible-portion cost, and food cost percentage — gives you the numbers you need to price menus honestly, order accurately, and protect profitability. These calculations are tested on the ACF Certified Culinarian exam and are daily practice in real kitchens.

As-Purchased Cost vs. Edible-Portion Cost

As-purchased (AP) cost is what you actually pay the supplier for an ingredient in the condition it arrives — bones, skin, trim, and all. Edible-portion (EP) cost is the true cost of the usable part after all trimming, peeling, boning, or cooking loss is removed.

Because you pay for the whole item but only serve part of it, EP cost is always equal to or higher than AP cost. Using AP cost alone to price a menu leads to underpricing and financial loss.

Yield Percentage

Yield percentage expresses what fraction of the AP weight is actually usable. You find it through a trim test: weigh the raw item, trim it to serving condition, then weigh the usable product.

Formula:

> Yield % = (Edible portion weight ÷ AP weight) × 100

Example: a 5 lb chicken breast yields 4 lb of cleaned meat.

> Yield % = (4 ÷ 5) × 100 = 80%

Keep trim-test records on a data sheet so the result can be repeated and verified. Different purveyor grades, seasons, and butchering styles change yield, so retest when your supplier or product changes.

Edible-Portion Cost

Once you know yield percentage, convert it to a decimal and divide it into the AP price per pound (or per unit):

> EP cost = AP price per lb ÷ yield % (as a decimal)

If chicken breasts cost $3.20/lb AP and yield 80%:

> EP cost = $3.20 ÷ 0.80 = $4.00/lb

You pay $4.00 for every pound of usable chicken, not $3.20. This is the number to use when costing a recipe.

Recipe Scaling with a Conversion Factor

A standardized recipe is written for a set number of portions. When production needs change, you scale up or down using a conversion factor (CF):

> CF = Desired yield ÷ Original yield

Then multiply every ingredient quantity by the CF:

> New quantity = Original quantity × CF

Example: a recipe written for 10 portions must be made for 75 portions.

> CF = 75 ÷ 10 = 7.5

An ingredient that was 2 cups becomes 2 × 7.5 = 15 cups.

Note: scaling is straightforward for most ingredients, but spices, leavening agents, and salt often need a slight downward adjustment when scaling large. Always taste and verify seasoning during production.

Food Cost Percentage

Food cost percentage tells management what portion of food sales revenue was spent on ingredients:

> Food cost % = (Cost of food used ÷ Food sales) × 100

Most full-service restaurants target a food cost percentage in a range that is specific to their concept and price point; many operations aim somewhere between 28% and 35%, though fine dining and quick-service venues vary. Your employer will tell you the house target.

If weekly food cost is $4,200 and food sales are $14,000:

> Food cost % = ($4,200 ÷ $14,000) × 100 = 30%

When food cost percentage runs above target, common corrective actions include tightening portion control, reducing waste and over-production, renegotiating supplier prices, or adjusting menu prices.

Portion Control

Portion control means serving exactly the specified weight or volume every time. Tools include a calibrated portion scale, ladles sized to a known volume, and standardized scoops. A single extra ounce per plate across hundreds of covers adds up to significant unplanned cost. ServSafe and ACF both emphasize that controlled portioning also supports consistent quality and customer trust.

Safety Considerations

Trim tests involve knives, meat slicers, and sometimes band saws. Always wear cut-resistant gloves when trimming proteins, keep cutting boards stable (use a damp towel underneath), and follow your kitchen's personal protective equipment (PPE) policy. Never reach into a slicer blade area without engaging the machine guard and confirming power is off — follow lockout/tagout procedures for any equipment maintenance. Weigh raw proteins on a dedicated scale kept separate from ready-to-eat foods, and sanitize all surfaces and tools between proteins to prevent cross-contamination, in line with ServSafe food-safety standards.

Putting It All Together

A complete recipe cost card shows the EP cost of each ingredient, the quantity used per portion, the cost per portion, and the selling price needed to hit the target food cost percentage. Building this habit now prepares you for the ACF Certified Culinarian practical and written exams and for the real financial responsibilities of a professional kitchen.

Key terms8

As-Purchased (AP) CostThe price paid to a supplier for an ingredient in the condition it is delivered, including unusable trim, bones, or moisture.
Edible-Portion (EP) CostThe cost per pound (or unit) of the usable portion of an ingredient after trimming, calculated by dividing AP cost by yield percentage expressed as a decimal.
Yield PercentageThe ratio of usable product weight to as-purchased weight, expressed as a percentage; determined through a trim test.
Trim TestA procedure in which a raw ingredient is weighed before and after cleaning and trimming to determine the actual usable yield.
Conversion Factor (CF)A multiplier used to scale a standardized recipe; calculated by dividing the desired yield by the original recipe yield.
Standardized RecipeA recipe that has been tested, adjusted, and written to produce a consistent yield and quality when followed exactly in a specific kitchen.
Food Cost PercentageThe ratio of the cost of food used to food sales revenue, expressed as a percentage; a key indicator of kitchen financial performance.
Portion ControlThe practice of measuring and serving exact specified quantities of food every time, using scales, ladles, or standardized scoops to maintain consistent cost and quality.

Worked examples4

1. Yield percentage and EP cost — beef tenderloin: A whole beef tenderloin is purchased at $18.00/lb. After trimming silverskin and excess fat, a trim test shows the AP weight was 8 lb and the cleaned usable weight is 6 lb. What is the yield percentage and the EP cost per pound?
  1. Step 1 — Calculate yield percentage: Yield % = (Edible portion weight ÷ AP weight) × 100 = (6 ÷ 8) × 100 = 75%.
  2. Step 2 — Convert yield percentage to a decimal: 75% ÷ 100 = 0.75.
  3. Step 3 — Calculate EP cost: EP cost = AP price per lb ÷ yield decimal = $18.00 ÷ 0.75 = $24.00 per lb.
Answer: Yield percentage = 75%; EP cost = $24.00 per lb.
2. Recipe scaling — chowder base: A standardized fish chowder recipe is written for 10 portions and calls for 2.5 lb of fish fillet, 1.5 qt of heavy cream, and 0.5 lb of diced onion. Scale the recipe to 75 portions.
  1. Step 1 — Calculate the conversion factor (CF): CF = Desired yield ÷ Original yield = 75 ÷ 10 = 7.5.
  2. Step 2 — Multiply each ingredient by the CF: Fish fillet: 2.5 lb × 7.5 = 18.75 lb.
  3. Step 3 — Heavy cream: 1.5 qt × 7.5 = 11.25 qt.
  4. Step 4 — Diced onion: 0.5 lb × 7.5 = 3.75 lb.
Answer: For 75 portions: 18.75 lb fish fillet, 11.25 qt heavy cream, 3.75 lb diced onion.
3. Food cost percentage: During one week, a restaurant recorded total food sales of $22,500 and a cost of goods (food used) of $7,425. Calculate the food cost percentage and state whether it falls within a 28–35% target range.
  1. Step 1 — Apply the food cost percentage formula: Food cost % = (Cost of food used ÷ Food sales) × 100.
  2. Step 2 — Divide: $7,425 ÷ $22,500 = 0.33.
  3. Step 3 — Multiply by 100: 0.33 × 100 = 33%.
  4. Step 4 — Compare to target: 33% falls within the 28–35% target range.
Answer: Food cost percentage = 33%; this is within the 28–35% target range.
4. EP cost applied to recipe costing — fish fillet: A recipe calls for 5 lb of usable fish fillet. The fish is purchased at $9.60/lb AP, and a trim test shows a yield of 80%. What is the EP cost per pound, and what is the total ingredient cost for 5 lb of usable fish?
  1. Step 1 — Convert yield to decimal: 80% ÷ 100 = 0.80.
  2. Step 2 — Calculate EP cost per lb: EP cost = $9.60 ÷ 0.80 = $12.00 per lb.
  3. Step 3 — Calculate total cost for 5 lb of usable fish: Total cost = 5 lb × $12.00 = $60.00.
  4. Step 4 — Verify logic: because yield is less than 100%, more AP product must be purchased. AP needed = 5 lb ÷ 0.80 = 6.25 lb; cost check = 6.25 × $9.60 = $60.00. ✓
Answer: EP cost = $12.00/lb; total ingredient cost for 5 lb of usable fish = $60.00.

The math in this lesson1

Learners compute a 75% tenderloin yield and divide $18.00 AP cost for $24.00 EP per pound.
7.RP.3
Brush up in the math halls at newSchoolWorks.com:
In class: Given invoiced prices and trim-test data for three proteins (chicken breast, beef tenderloin, fish fillet), students calculate yield percentage and edible-portion cost for each using the standard formula: EP cost = AP price ÷ yield %. · Scale a standardized recipe from 10 portions to 75 portions using a conversion factor, recalculate the ingredient quantities, and estimate the total recipe cost using provided unit prices. · Work through a food cost percentage scenario: given total food sales and total cost of goods used for a week, calculate food cost percentage, compare it to a target range, and identify one operational change that could improve it.
Materials: Calculator, recipe cost worksheets, trim-test data sheets, sample invoices, standardized recipe cards (instructor-provided), food cost percentage formula reference card, culinary math textbook (e.g., Math for the Professional Kitchen)
Check: All calculations on the food cost worksheet are correct within a 2% rounding tolerance; recipe scaling is accurate for all ingredients; students score 80% or higher on a short applied-math quiz.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Culinary math and recipe costing
1. A whole chicken leg quarter weighs 1.5 lb as purchased. After removing bone and skin, the usable meat weighs 0.9 lb. What is the yield percentage?
Culinary math and recipe costing
2. Salmon is purchased at $12.00 per pound AP. A trim test shows a yield of 75%. What is the edible-portion cost per pound?
Recipe scaling and standardization
3. A standardized soup recipe produces 20 portions. You need to produce 90 portions. What is the correct conversion factor?
Recipe scaling and standardization
4. A recipe scaled from 10 to 75 portions originally calls for 0.25 cup of kosher salt. After applying the conversion factor of 7.5, the scaled quantity is 1.875 cups. What is the best professional practice before finalizing this scaled recipe?
Food cost control and kitchen management
5. A restaurant's weekly food cost is $5,600 and food sales total $18,667. Which of the following is the closest food cost percentage?
Food cost control and kitchen management
6. A chef notices that the kitchen's food cost percentage has risen above the target range for two consecutive weeks. Which of the following operational changes is most directly likely to bring food cost percentage back down?
Culinary math and recipe costing
7. During a trim test on beef tenderloin, a cook weighs the raw loin at 10 lb. After trimming, the usable meat weighs 7 lb. The AP cost is $22.00/lb. What is the EP cost per pound?
Food safety and sanitation
8. According to ServSafe food-safety principles, which of the following practices is most important when conducting trim tests on multiple raw proteins such as chicken, beef, and fish?
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